Here are some of my Calcium-K images. I have a SM90CaK and a PST Cak to use. The waveband is centred on 3993nm at 2.2A bandwidth and is more susceptible to poor atmospheric seeing conditions.

Here is a short animation of AR2192 on the 24 October 2014 from 09:59 to 10:19UT in reasonable seeing conditions

A full disc mosaic at 09:52 UT

Here is a large format CaK animation from 9 May 2014 from 13:07 to 15:11 UT seeing very variable.

Here is a CaK mosaic from 2014-03-16 at 16:21UT

2013-08-04 here is a CaK animation from 10:08 to 10:48UT in grade 2 to grade 3 seeing conditions.

2013-08-04 here is a CaK mosaic from 09:50 to 09:58UT in grade 2 to grade 3 seeing conditions.

30 April 2013 here is my first attempt at 3.2m focal length movie this is AR1731 from 16:51 to 17:15UT in poor grade 3 to grade 4 seeing.

30 April 2013 here is my first attempt at a large CaK mosaic.

27 August 2012 here is my first attempt at a CaK movie

This is a 3-panel mosaic from 2 April 2011 showing lots of active regions.

This is a two-frame mosaic of Active Regions numbers AR1169, AR1166 and AR1164 photographed on 8 March 2011 using 90mm Solarmax CaK.

13 April 2010 here is a huge prominence lift off event at 09:10UT.